"I don't know what your f–––in' name is," Witherspoon, 38, says in a NSFW video that was reportedly taken after the Met Gala. "That's super-French ... c'est la vie."

In separate short video (also NSFW), she tells Delevingne, "If you force me to say your last name, I'll be f–––ed."

The 21-year-old model, who is English, then begs Witherspoon to say her name – and she obliges with a charming twang.

Kate Upton and Zooey Deschanel are also along for the rowdy ride captured in the short videos, which Delevingne uploaded to Instagram before deleting them.

Before stepping out of the elevator, the feisty Oscar winner delivers this saucy take on names: "The most important thing in a name, for a girl," she says with a drawl, "is that a man can whisper it in his pillow."